Experimental Research of the Process Bio-corrosion of Cement Concrete for Inspection of Building Structures

Fedosov, S. V.; Rumyantseva, Varvara E.; Loginova, S. A.; Goglev, I. N.

doi:10.1007/978-3-030-68984-1_25

Cited by 1 publication

(7 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be clearly seen on examining structures operated in a humid environment for a long time (Fig. 1a,b) [4]. Figure 1 clearly shows the concrete protective layer failing as a result of the concrete carbonation; the horizontal prestressed steel reinforcement is bared and covered with corrosion products.…”

Section: Introductionmentioning

confidence: 96%

“…The hydrogen pH value influences on the passivation properties of the protective concrete layer significantly. According to various studies, the concrete potential of hydrogen at loss of passivation is 8˂rH˂9.5 [2][3][4][5]. Loss of passivation of steel reinforcement to concrete begins at pH˂11 [4].…”

Section: Introductionmentioning

confidence: 99%

“…According to various studies, the concrete potential of hydrogen at loss of passivation is 8˂rH˂9.5 [2][3][4][5]. Loss of passivation of steel reinforcement to concrete begins at pH˂11 [4].…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence, there is a neutralization of the alkaline environment of the concrete. The excessive carbon dioxide in a humid environment (2) provides the formation of calcium hydrogen carbonate, a soluble compound, is able to be washed away by ambient moisture and removed away by atmospheric water [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…The single working pH-transition coloring interval of phenolphthalein solution, as well as the absence of consensus on concrete pH are their significant disadvantages. [4,5]Under these conditions concrete pH begins to lose its passivation properties relative to the steel reinforcement. But, in spite of the concrete carbonation studies, experts do not achieve a consensus on this issue [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Possibilities of using alizarin and neutral red indicators to determine the neutralized layer of concrete in the field

2023

View full text Add to dashboard Cite

The article concerns with the prospects of using the phenolphthalein test solution in the practice of surveying concrete and reinforced concrete building structures in planta. The problem of the study is the limits of application of the phenolphthalein test solution on the pH level of the determined concrete (the indicator works only at 8≤rn≤10). There is a need of expanding the phenolphthalein test solution application. In order to determine the different pH zones of concrete we have to modernize the method by adding other indicators to phenolphthalein. The standard phenolphthalein test solution does not allow a high degree of accuracy in determining the most sensitive to carbonation boundary zones of concrete. We proposed to modernize the phenolphthalein sample solution by using additional acid-base indicators alizarin and neutral red. We presented the results of experiments on measuring the surface neutralized layer of concrete by alcoholic solutions of acid-base indicators alizarin and neutral red on different age and size concrete samples. As a result, one of the proposed indicators (neutral red) allows to expand the phenolphthalein test solution application. We compared the results obtained by the traditional and modified methods. According to it, the proposed modified method is more accurate one.

show abstract

Section: Introductionmentioning

confidence: 96%